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Old 5th May 2006, 16:38   #1
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Default MPFI & Fuel intake

HI Guys,

w.r.t MPFI engines pls tell me....(assuming the AC is switched off)

1. is the fuel intake constant during idling?
2. is the fuel intake only controlled by the accelerator pedal?
3. if vehicle is in 5th gear @ 50 kmph, i slow it down to 30 kmph, now if i press the pedal completely the rpm increases very slowly, does it mean that a lot of fuel is supplied but not used in the engine?
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Old 5th May 2006, 16:43   #2
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1. Fuel intake is constant during idling under normal running.

2. No, the ecu also can independantly change the rpm according to the load conditions such as AC being switched on or during start up when the rpm is temporarily raised to warm up the engine.

3. Yes, the ecu enriches the air-fuel mixture as per the load conditions. You cant call it wasted fuel...but its best to shift down a cog.


Last edited by drifter : 5th May 2006 at 16:44.
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